Yeah, and that is normal.

Q is defined as Fc/Fh-Fl. Fh and Fl are defined as -3dB points. As soon as you boost beyone +3dB you're boosting outside of that range. For a Q=1, Fc=25Hz, those -3dB points are going to be approximately 17Hz and 42Hz. (Estimate - It centers on a logarithmic frequency scale.)